I do not believe that this is the case. Gasoline engines don't tolerate the immense swings of mixture as well as diesels do, so there is more need to restrict the air flow into the combustion chamber than with a diesel.

I'm pretty sure that most GDI engines still have throttles. Some may only be used for warm-up (I think I've read that somewhere) but I am pretty sure that most do control the engine load with a throttle mechanism.

-soD

I wondered about this, too, but according to this article aerohead's comment appears to be true, at least for current state-of-the-art GDI engines. The best of all ICE worlds, as it were.

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Best tank ever: 72.1 mpg in February 2005, Seattle to S.F.
New personnal best 'all-city' tank June '08 ... 61.9 mpg!
Thanks to 'pulse-n-glide' technique.